I have been going through many threads on SO and some other forums. So I thought I would summarize "What is SQL JOIN?" and "What are different types of SQL JOINs?".
Recently NoSQL has gained immense popularity. What are the advantages of NoSQL over traditional RDBMS?
I have a relation in a database: Emp_project(SSN,PNum,Hours,Ename,PName,Plocs) I have been asked to normalize the relation Emp_project. How do I normalize it?
When setting up foreign keys in SQL Server, under what circumstances should you have it cascade on delete or update, and what is the reasoning behind it? This probably applies to other databases as w...
In cleaning up this answer I learnt a bit about TRIGGERs and stored procedures in MySQL, but was stunned that, while BEFORE INSERT and BEFORE UPDATE triggers could modify data, they seemingly couldn't...
Design patterns are usually related to object oriented design. Are there design patterns for creating and programming relational databases? Many problems surely must have reusable solutions. Examples...
What is the command to drop all tables in SQLite? Similarly I'd like to drop all indexes.
So I recently learned about ASSERTION in my databases course, and my prof noted that major databases don't support it, even though it is in the SQL-92 standard. I tried googling to find out why, but ...
I have a data frame, called df, that looks like this: dte, val 2012-01-01, 23.2323 2012-01-02, 34.343 The type on the columns is date and numeric. I would like to write this to a MySQL database us...
I want to using solr for search on articles I have 3 table: Group (id , group name) ArticleBase (id, groupId, some other field) Article(id, articleBaseId, title, date, ...) in solr schema.xml ...